Dashed left edge = started before May 2004 ·
Dashed right edge = ongoing beyond May 2004
Events in May 2004 7
20042004 World Snooker ChampionshipO’Sullivan Title 2Winner: Ronnie O’Sullivan; Runner-up: Graeme Dott. Score: 18–8.
2004Amy Winehouse wins an Ivor Novello AwardStronger Than MeBest contemporary song for her first single.
2004EU AccessionJoining the WestPoland officially became a member of the European Union.
2004EU expands to 25 nationsTen new countries join European UnionTen new countries including Poland, Hungary, Czech Republic and the Baltic states joined the European Union on May 1, 2004, in the largest single expansion in EU history.
2004Assassination of Akhmad KadyrovChechen president killed in a bombing at a Grozny stadiumA bomb hidden beneath a VIP stand detonated during a Victory Day parade in Grozny, killing Chechnya's Moscow-backed president Akhmad Kadyrov. His son Ramzan later rose to power in the republic.
2004Massachusetts legalizes same-sex marriageFirst US state to issue marriage licenses to same-sex couplesFollowing a state Supreme Judicial Court ruling, Massachusetts began issuing marriage licenses to same-sex couples on May 17. It was the first US state to do so, preceding a nationwide legal shift by over a decade.
2004Harry Potter and the Prisoner of Azkaban#3 film of 2004 — $796m worldwideDirected by Alfonso Cuarón. Harry learns a convicted murderer has escaped from prison — and may be coming for him.